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Siemens RDG20 KN Series Basic Documentation
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Siemens RDG20 KN Series Basic Documentation

Siemens RDG20 KN Series Basic Documentation

Room thermostats with knx communications
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RDG20..KN.. & RDG26..KN..
Room thermostats with KNX communications
Basic Documentation
A6V11545892_en--_c
Smart Infrastructure
2022-04-12

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Summary of Contents for Siemens RDG20 KN Series

  • Page 1 RDG20..KN.. & RDG26..KN.. Room thermostats with KNX communications Basic Documentation A6V11545892_en--_c Smart Infrastructure 2022-04-12...

  • Page 2: Table Of Contents

    Table of Contents About this document ............... 5 Revision history ...................5 Reference documents ..................5 Before you start ...................6 Trademarks ..................6 1.3.1 Copyright ..................6 1.3.2 Quality assurance .................7 1.3.3 Document user/request to the reader ..........7 1.3.4 Target audience, prerequisites ..............7 Glossary ......................8 Overview..................
  • Page 3 Scheduler .................. 62 4.6.7 M/S, Manager/subordinate ............64 4.6.8 Preventive operation ..............68 4.6.9 NFC communication..............68 4.6.10 monitoring and control ..........68 4.6.11 IAQ – CO Control sequences ..................75 Sequence overview (setting via P001) ........75 4.7.1 Application mode ............... 76 4.7.2 2-pipe fan coil unit ..............
  • Page 4 ETS ......................145 Setting parameters in ETS ............146 5.1.1 ACS tool ....................148 Setting parameters in ACS ............148 5.2.1 Operation and monitoring with ACS........... 150 5.2.2 Operation and monitoring with OZW772 ........154 5.2.3 Connection ..................155 Connection terminals ................155 Connection diagrams ................

  • Page 5: About This Document

    About this document Revision history 1 About this document 1.1 Revision history Edition Date Changes Section September First version. 2020 ● ● November Update NFC communication info 4.6.8 2020 ● ● Update changeover picture 4.7.9.2 ● ● Update the picture of DC 0…10 V fan in "Fan control with modulating heating/cooling control"...

  • Page 6: Before You Start

    ® and ™) of trademarks for the purposes of legibility based on the reference in this section. 1.3.2 Copyright This document may be duplicated and distributed only with the express permission of Siemens, and may be passed only to authorized persons or companies with the required technical knowledge. 6 | 180 A6V11545892_en--_c...

  • Page 7: Quality Assurance

    1.3.4 Document user/request to the reader Before using products from Siemens Industry, Inc., it is important that you read the documents supplied with or ordered at the same time as the products (equipment, applications, tools, and so on) carefully and in full.

  • Page 8: Glossary

    About this document Glossary 1.5 Glossary The inputs, outputs and parameters of an application can be influenced in various ways. These are identified by the following symbols in this document: Parameters identified by this symbol are set using ETS. Parameters identified by this symbol are set using ACS. Setting RDG2..KN KNX parameters is only supported by the following tool versions: ●...

  • Page 9: Overview

    Overview Types 2 Overview 2.1 Types For fan coil units, universal applications and compressors in DX-type equipment applications Product no. Stock no. Housing Operating Number of control outputs Built-in sensor color voltage 3-speed On/Off 3-pos DC On/Off T: Temperature (3-wire) H: Humidity RDG200KN S55770-T409...
  • Page 10 Overview Functions ● Chilled and/or heated ceiling/2-stage ● Chilled/heated ceiling (4-pipe) with 6-port ball valve (RDG26..KN) ● Chilled/heated ceiling with PICV and 6-port ball valve as changeover (RDG26..KN) Compressor applications via On/Off control: ● Heating or cooling, compressor in DX-type equipment ●...
  • Page 11 Overview Functions Setting ● Application selection via DIP switches or external commissioning software (ACS, ETS and Siemens smartphone application PCT Go) ● Parameter download with external commissioning software (ACS, ETS and Siemens smartphone application PCT Go) ● Reloading factory settings for commissioning and control parameters ●...
  • Page 12 ● Energy supply optimization via energy demand signal via Synco RMB795B central control unit ● Interworking with Siemens AQR.. and QMX.. sensors for room humidity, room temperature and CO measurement ● Interworking with Siemens QMX.. room operator units for room humidity, room temperature and operating commands for fan, operating mode and setpoints ●...

  • Page 13: Accessories

    Accessories 2.3 Accessories Type Product/stock no. Datasheet KNX power supply 5WG1 125-1AB02 TPI_N125 160 mA (Siemens BT LV) KNX power supply 5WG1 125-1AB12 TPI_N125 320 mA (Siemens BT LV) KNX power supply 5WG1 125-1AB22 TPI_N125 640 mA (Siemens BT LV)
  • Page 14 Overview Equipment combinations On/Off actuators Type of unit Product Datasheet Electromotive On/Off actuator SFA21.. 4863 SFA71.. Electromotive On/Off valve and actuator MVI../MXI.. A6V11251892 (only available in AP, UAE, SA and IN) Zone valve actuator (only available in A6V10446174 AP, UAE, SA and IN) On/Off and PWM actuators Type of unit...
  • Page 15 Overview Equipment combinations Type of unit Product Datasheet Electric actuator, 3-position (for small SSD31.. 4861 valve 5 mm) AC 230 V Electric actuator, 3-position (for SAS31.. 4581 valves 5.5 mm) AC 230 V Rotary actuators for ball valves, 3- GDB331.9E 4657 position Rotary actuators for ball valves, 2 or...
  • Page 16 Rotary actuators for ball valves KNX S- GDB111.9E/KN A6V10725318 Mode The documents can be downloaded from https://hit.sbt.siemens.com With PWM control, exact parallel run of 2 or more thermal actuators is not possible . If several fan coil units are controlled by the same room thermostat, motorized actuators with On/Off or 3-position control are preferred.

  • Page 17: Integration Via Knx Bus

    Synco ACS ● ETS5 or higher versions ● Siemens smartphone application PCT Go Synco 700 The RDG2..KN room thermostats are especially tailored for integration into the Synco 700 system and operate together in LTE-Mode. This extends the field of use of Synco for individual room control in conjunction with fan coil units, chilled ceilings and radiators.
  • Page 18 Gamma Instabus For lighting control and other room electrical applications Desigo and third-party The RDG2..KN thermostats can be integrated into the Siemens building systems automation and control systems (BACS) Desigo or into third-party systems. Either S-Mode (group addressing) or individual addressing can be used for integration.

  • Page 19: Notes

    Notes Mounting and installation 3 Notes 3.1 Mounting and installation Mounting ● The devices are suitable for wall mounting. ● Recommended height: 1.5 m above the floor. ● Do not mount the devices in recesses, shelves, behind curtains or doors, or above or near heat sources.

  • Page 20: Commissioning

    If all DIP switches are Off, NO APPL displays, indicating that application commissioning via a tool is required. Commissioning via The Siemens smartphone application Product Commissioning Tool (PCT Go) is a Siemens smartphone commissioning tool that allows users to: application PCT Go ●...
  • Page 21 Assign KNX address Assign complete KNX address (area, line and device) via: ● HMI or Siemens smartphone application PCT Go by setting parameters P898 (area address), P899 (line address) and P900 (device address) ● ACS or ETS (P900: device address) Set the device address to 255 to deactivate the communication (no exchange of process data).

  • Page 22: Operation

    Notes Operation 3.3 Operation The room thermostat consists of two parts: ● Plastic housing with electronics, operating elements and room temperature sensor ● Mounting plate with the screw terminals The housing engages in the mounting plate and is secured with 2 screws. Layout Standard (selectable scheduler) Hospitality...
  • Page 23 Notes Operation User action Effect, description Press left button (P002 = 3 and P009 = 1) Toggle between ° C and ° F (for details, see display in Temperature control [➙ 26]) Press left button while "Operating mode" via bus is Activate "Extend Comfort mode"...

  • Page 24: Remote Operation

    Notes Remote operation Symbol Description Symbol Description Operating mode Scheduler selection/Unit switching Fan speed selection Escape Delete schedule Confirm parameters Number of schedules or Time bar for schedule subordinate alarms Indoor air quality Outside temperature Additional user Morning: 12-hour format information, such as Afternoon: 12-hour format outside temperature,...

  • Page 25: Cyber Security Disclaimer

    Siemens’ portfolio undergoes continuous development to make it more secure. Siemens strongly recommends that updates are applied as soon as they are available and that the latest versions are used. Use of versions that are no longer supported, and failure to apply the latest updates may increase your exposure to cyber threats.

  • Page 26: Functions

    Functions Temperature control 4 Functions 4.1 Temperature control General note: Setting control parameters (P001 etc. mentioned throughout the document), see Parameters Control parameters [➙ 135]. Temperature control The thermostat acquires the room temperature via built-in sensor, external room temperature sensor (LG-Ni1000 or NTC 3k), external return air temperature sensor (LG-Ni1000 or NTC 3k) or via KNX (S-Mode or LTE-Mode), and maintains the setpoint by delivering actuator control commands to heating equipment, cooling equipment, or both.

  • Page 27: Operating Modes

    Functions Operating modes 4.2 Operating modes The thermostat operating mode can be influenced in different ways (see Different ways to influence operating mode [➙ 28]). Specific heating and cooling setpoints are assigned to each operating mode. Room operating mode: The thermostat sends the current room operating mode via bus. State The following operating modes are available: Operating...

  • Page 28: Different Ways To Influence Operating Mode

    Functions Operating modes 4.2.1 Different ways to influence operating mode Source for change of Different interventions can influence the operating mode. operating mode The source of the actual room operating mode state can be monitored using the "Cause" diagnostic data point in the ACS tool or web server OZW772. Value of data point Source Description...
  • Page 29 Functions Operating modes Priority Description Remark ● Presence detector Standard presence mode: If a room is ④ occupied, the operating mode changes to Comfort. This overrides the operating mode on the thermostat. Unoccupied rooms set back the thermostat to the previous operating mode. ●...
  • Page 30 Functions Operating modes You can change the operating mode by pressing the operating mode button. The selected operating mode remains "temporary" until command "Room operating mode: Time switch" is received. When the thermostat automatically operates in Economy, users can set the thermostat to Comfort via HMI when: ●...
  • Page 31 Functions Operating modes Available op. mode End user P002 Description op. mode button Schedule via bus Recommended for commercial buildings: ⇨ ● Switching manually between modes by pressing the operating mode button ● User settings are temporary and valid until the next switching event ⇨...
  • Page 32 Functions Operating modes The operating mode can be changed to Comfort or Economy based on room occupancy (room occupied or unoccupied, via presence detector or keycard). For details, see Presence detector [➙ 49] Presence detector Temporary timer to extend Comfort mode can be temporarily extended (e.g., working after business hours or Comfort mode on weekends) when the thermostat is in Economy mode.
  • Page 33 Functions Operating modes During the extended presence/absence periods, symbol is displayed. Function if no time schedule is received via bus User profile for Operatin Mode Operating Operating Function operating mode g mode mode mode at button (selected via P002) when during the end of activating...

  • Page 34: Communication Examples

    Functions Operating modes 4.2.2 Communication examples The following examples show 3 typical applications for a central time schedule together with local control of the room operating mode. The room operating mode in rooms 1…3 of a building is determined by the time schedule.
  • Page 35 Functions Operating modes Example 2 Interaction of user operation (operating mode button) and central time schedule In Room 2, the window is opened briefly, once in the morning and once in the late afternoon (1). Only the opening in the morning directly influences actual room operating mode. With the operating mode button, the operating mode can be changed between OFF and Auto or to temporary Comfort extension.
  • Page 36 Functions Operating modes Example 3 Application for "Window contact", "Presence detector" and "Central time schedule" In Room 3, the time schedule is between 13:00 and 17:00. ● In the morning, as soon as presence is detected, the operating mode switches to Comfort (1) ●...

  • Page 37: Room Temperature Setpoints

    The factory setting for the Comfort basic setpoint is 21 ° C and can be changed in the thermostat’s EEPROM via P011, bus with communication object "Comfort basic setpoint" or Siemens smartphone application PCT Go. The last option selected is always used.

  • Page 38: Setting And Adjusting Setpoints

    Functions Room temperature setpoints Example Cooling setpoint adjustable: 25…40 ° C Heating setpoint adjustable: 5…21 ° C ● For 4-pipe applications: – The thermostat runs on the setpoint of the active sequence: In heating mode, the heating setpoint is active and adjustable via rotary knob.
  • Page 39 Comfort basic setpoint KNX tool Comfort setpoint ● Central control unit Economy heating setpoint ● Siemens smartphone application PCT Go The thermostat saves the setpoints to: Economy cooling setpoint ● EEPROM in the form of parameters ● Runtime memory The figure below shows the interrelation: Only required for heating and cooling applications (see Setpoints and sequences [➙...
  • Page 40 Functions Room temperature setpoints is not too great. If the outside temperature is higher than 26 ° C and 6 K above the Cooling setpoint tracking Comfort cooling setpoint, the related setpoint is shifted and kept 6 K below the depending on outside outside temperature.
  • Page 41 Functions Room temperature setpoints General notes ● The supported communication objects are different in LTE-Mode and S-Mode ● Changes via the local HMI or tools have the same priority (the last option is always used) ● Setting the Comfort basic setpoint resets the runtime Comfort setpoint only when P103 = 0 Notes on setpoint ●...

  • Page 42: Application Overview

    Remote configuration, via commissioning tool (factory setting) ON = ● Synco ACS DIP NO.: 1…5 ● ● Commissioning via Siemens smartphone application PCT OFF = DIP NO.: 1…5 RDG20..KN RDG26..KN Application Application Fan coil fan speed...

  • Page 43: Applications For Fan Coil Systems

    Functions Application overview 4.4.1 Applications for fan coil systems Applications, DIP setting, control outputs ● ● ● 2-pipe fan coil unit 2-pipe fan coil unit 2-pipe fan coil unit with electric heater with radiator/floor heating Using RDG20..KN, RDG26..KN Using RDG20..KN, RDG26..KN Using RDG20..KN, RDG26..KN ●...

  • Page 44: Applications For Universal Systems

    Functions Application overview 4.4.2 Applications for universal systems Applications, DIP setting, control outputs ● ● ● Chilled/heated Chilled/ Chilled/heated ceiling heated ceiling ceiling and and electric radiator/floor heater heating Using RDG20..KN, RDG26..KN Using RDG20..KN, RDG26..KN Using RDG20..KN, RDG26..KN ● ● ●...

  • Page 45: Application For Heat Pump Systems

    Functions Application overview 4.4.3 Application for heat pump systems Applications, DIP setting, control outputs ● ● Heated or cooled with Heated or cooled with compressors compressors with electric heater Using RDG20..KN, RDG26..KN Using RDG20..KN, RDG26..KN ● ● Heated and cooled with 2-stage heated or cooled compressors with compressors...

  • Page 46: Power Supply Selection For Rdg20

    Functions Power supply selection for RDG20..KN 4.5 Power supply selection for RDG20..KN The RDG20..KN can be powered either on AC 230 V or AC 24 V. The desired power supply is selected via the power switch on the rear of the device. The default setting is AC 230 V.

  • Page 47: Additional Functions

    Avoid damage from moisture (P363, P364) To prevent from damage of moisture ✓ ✓ NFC communication [➙ 68] ● NFC communication via Siemens smartphone NFC (P500) ✓ ✓ application IAQ – CO2 monitoring and control [➙ 68] (RDG204KN, RDG264KN) ●...

  • Page 48: Sensors And Changeover Functions

    Functions Additional functions 4.6.1 Sensors and changeover functions Heating/cooling The heating/cooling changeover information is received via bus. This is only changeover via bus (KNX) possible if the control sequence is set to automatic heating/cooling changeover (P001 = 2) and no local input (X1, X2, U1) is assigned to this function. In required information is unavailable (e.g., due to data communication issues, power failure, etc.), the thermostat operates in the last valid room operating mode (heating or cooling).

  • Page 49: Presence Detector

    Functions Additional functions P151 (X1), P154 (X2) or P156 (U1) = 0 P151 (X1), P154 (X2) or P156 (U1) = 1 (default, normally open) (Normally close) Contact open ⇨ cooling mode Contact open ⇨ heating mode Contact closed ⇨ cooling mode Contact closed ⇨...

  • Page 50: Output Functions

    Functions Additional functions Time schedule via Presence detector behavior Comfort mode When hotel guests leave their rooms (room is unoccupied), the operating mode changes to Economy. The buttons are locked and symbol is displayed. Economy mode ● When hotel guests leave their rooms (room is unoccupied), the operating mode changes to Economy.
  • Page 51 Functions Additional functions to start heating using the panels (1 stage heating, YHC1) and start cooling using the fan coil unit (1 stage cooling, YHC2). Enable the swap function by setting P254 (YHC2 output signal, 1 stage in cooling) to ON, depending on the requested control signal. Swap function disabled Swap function enabled P254 is set to Off...
  • Page 52 Functions Additional functions The relay output function can be enabled and tested as follows: Relay output function Enable function via Test function via on … Expert level parameter diagnostic parameter P400 P401 P402 Switching off external The external equipment (e.g., fan coil unit) can be switched off via relay output to equipment in Protection save energy when the thermostat is in Protection mode and no temperature control mode...

  • Page 53: Monitoring And Limiting Functions

    Functions Additional functions Note When the operating mode is changed from Comfort to Economy or Protection, the relay contact remains energized until the end of the minimum on time set via P212. 4.6.4 Monitoring and limiting functions Floor temperature The floor temperature should be limited for two reasons: Comfort and protection of limitation function (P252) the floor.
  • Page 54 Functions Additional functions To enable this function, the multifunctional input, to which the supply air sensor is connected, needs to be set to "Supply air sensor" (e.g., P150 = 9). Then the parameters for the limits are displayed (P063: minimum supply air temperature, P064: maximum supply air temperature).
  • Page 55 Functions Additional functions If the fan function is enabled (P350 ≠ 0), the fan continues to work as long as the dewpoint function is active. Note When condensation is detected with ● Control only with 6-port control ball valve: – If P201 = 6 or 8, the valve closes (5 V).

  • Page 56: User Operation / Indication

    Functions Additional functions 4.6.5 User operation / Indication Note When the thermostat is set as subordinate (P258 = 0), P005 (scheduler), P028 (keypad), P110 (energy indicator) and P111 (energy indicator range) are invisible and the subordinate synchronizes the related operation with its manager. Button lock (P028) If the "Button lock"...
  • Page 57 Functions Additional functions – Fan speed: The manual fan is below or equal to the auto fan speed value – Operating mode: The manual mode is lower or equal to the scheduler mode ● Red leaf: The settings exceed the preset energy-efficiency range P110 configures the green leaf function: ●...
  • Page 58 Functions Additional functions Set DATE The scheduler function must be enabled before setting the date: ● Press once and then turn the rotary knob or press continuously to select programming mode DATE. ● Press once to enter the date setting. ●...

  • Page 59: Humidity

    Functions Additional functions 4.6.6 Humidity Humidity control (P007, Humidity control limits humidity in the room according to the selected setpoint P450) (low/high) by shifting the temperature setpoint, or by enabling outputs to release the external equipment as needed, e.g., the dehumidifier or humidifier. Humidity control is active in Comfort mode when P450 is set to 1.
  • Page 60 Functions Additional functions Note The maximum temperature shift setpoint value is reached at setpoint humidity high (P024) +10%. The contact for the dehumidifier is released at setpoint humidity +15%. Dehumidification Applications with a DC 0...10 V fan: ● Enable the function to control the external dehumidifier directly via relay output by setting P400 (output Q1), P401 (output Q2) or P402 (output Q3) to 7.
  • Page 61 Functions Additional functions Note For heating and cooling applications, the value of the dead zone (P055) must be bigger than the maximum shifting temperature setpoint (P461), to avoid changeover between heating and cooling sequences in the event of fast humidity changes in the room.

  • Page 62: Scheduler

    Time of day via bus, HMI or Siemens smartphone application PCT Go display on the thermostat (P009 = 3 or 4) in either 12- or 24-hour format. The option selected last is used.
  • Page 63 Functions Additional functions Note ● In Edit mode (value flashes), press to delete schedule or (Esc) to cancel the change. The maximum number of set schedules is three per day. ● In same schedule, the switching point for Economy cannot be earlier than that for Comfort.

  • Page 64: M/S, Manager/Subordinate

    Functions Additional functions 4.6.8 M/S, Manager/subordinate function has the following features: M/S - manager/subordinate ● For large rooms / open spaces, to save energy by synchronizing HVAC equipment and avoid running different equipment in heating and cooling at the same room. ●...
  • Page 65 Only the presence detector on the manager (external or built-in) controls the M/S - Presence detector manager/subordinate loop accordingly. Presence detection on local input takes priority. The M/S - manager/subordinate is configured via ETS/ACS or Siemens Setting smartphone application PCT Go. manager/subordinate Basic setting Set the thermostat as subordinate: (Default parameter setting is manager.)
  • Page 66 Functions Additional functions 4.6.8.1 Alarm management manager/subordinate The manager receives faults and alarms from its subordinates and displays the higher priority alarm with the subordinate identification number in the order received. If the manager has its own faults and alarms, it displays them instead. The subordinate sends the fault or alarm with highest priority to the manager.
  • Page 67 Functions Additional functions 4.6.8.2 Manager/subordinate communication in LTE-Mode The manager thermostat shares the configuration with its subordinates for the following: ● Room temperature and humidity value ● Operating mode ● Manual fan speed ● Current room setpoint and ChangeOverWaterStatus If any of the above values is changed on the manager, the change is synchronized to all subordinates within the same zone.

  • Page 68: Preventive Operation

    When NFC communication is enabled, the parameters can be configured even if the thermostat has no power. ● The phone must have active NFC functionality. For commissioning via Siemens smartphone application PCT Go, see Commissioning [➙ 20]. 4.6.11 IAQ – CO monitoring and control...
  • Page 69 Functions Additional functions Set P450 (Control strategy) = 0 and P009 (Additional display information) to the requested IAQ information on the display. When P009 is set as the following, CO information is displayed as numeric indication (P009) (concentration in ppm) or as text (GOOD, POOR, BAD) value, together with the IAQ symbol ●...
  • Page 70 Functions Additional functions IAQ CO concentration, level indication: GOOD GOOD BIEN GOED HYVA POOR OKAY OKAY OKAY POOR POOR BAJA LAAG HEIK. GYEN GOOD GOOD GOOD GOOD OKAY OKAY OKAY OKAY OKAY ORTA POOR POOR DLIG POOR SLAB POOR KOTU Error display ●...
  • Page 71 Functions Additional functions ● Use case b): IAQ - CO control in fan coil systems with direct fresh air from outside By activating the frost protection function and setting the frost protection setpoint (P109), the outside fresh air is provided via damper into the fan coil and then to the room.
  • Page 72 Functions Additional functions • 2-pipe+ el. heat On/Off + DC • 2-pipe/2-stage ✓ ✓ DC + On/Off ✓ • 4-pipe × ✓ ✓ ✓ ✓ 4-pipe+ el. heater • × • ✓ ✓ On/Off + 2 × ✓ ✓ ✓ ✓...
  • Page 73 Functions Additional functions Minimum damper position (P455) IAQ damper Xp IAQ damper P-band Xp (P454) IAQ setpoint (P023) Fan_min Min. DC 0...10 V fan speed (P357) The damper position depends on CO value. If CO (IAQ) concentration is higher than the setpoint (P023), damper is open. In dead zone (no H/C demand), damper does not open, and fan does not run until concentration reaches IAQ setpoint + ½...
  • Page 74 Functions Additional functions Notes: • When On/Off damper is selected, the fan speed depends on the higher fan request between temperature demand and IAQ demand. • For energizing the damper during IAQ demand, select “IAQ damper” P453 = 3 (normally close). This logic can be inverted by selecting P453 = 2 (normally open).

  • Page 75: Control Sequences

    Functions Control sequences 4.7 Control sequences 4.7.1 Sequence overview (setting via P001) The main control sequence (water coil sequence of the fan coil unit) can be set via P001. The following sequences can be activated in the thermostats (with or without auxiliary heating).

  • Page 76: Application Mode

    Functions Control sequences 4.7.2 Application mode The behavior of the thermostat can be influenced via building automation and control system (BACS) and bus using command "Application mode". Cooling, heating or both can be enabled or disabled using this signal. Application Application mode mode is supported in LTE-Mode and S-Mode.
  • Page 77 Functions Control sequences Application mode (via State Control sequence state changeover/continuous bus) (ACS diagnostic value) heating or cooling Auto (0) Heating Heating Cooling Cooling Heat (1), (2), (8) Heating Heating Cooling Heating Cool (3), (5) Heating Cooling Cooling Cooling Night purge (4), Heating Heating Fan only (9)

  • Page 78: 2-Pipe Fan Coil Unit

    Functions Control sequences 4.7.3 2-pipe fan coil unit In 2-pipe applications, the thermostat controls a valve in heating/cooling mode with changeover (automatically or manually), heating only, or cooling only (factory setting, P001 = 1). On/Off control The diagrams below show the control sequence for On/Off control. Control sequence Heating mode Cooling mode...

  • Page 79: 2-Pipe Fan Coil Unit With Electric Heater

    Functions Control sequences 4.7.4 2-pipe fan coil unit with electric heater Heating or cooling with In 2-pipe applications with electric heater, the thermostat controls a valve in auxiliary heater heating/cooling mode with changeover, heating only, or cooling only plus an auxiliary electric heater.
  • Page 80 Functions Control sequences Factory setting P217: 0.0 kW, setting range: 0.0…1.2 kW. On/Off control The diagrams below show the control sequence for On/Off control. Control sequence Heating mode Cooling mode On/Off output (changeover = heating or heating only) (changeover = cooling or cooling only) T[°...

  • Page 81: 2-Pipe Fan Coil Unit With Radiator Or Floor Heating

    Functions Control sequences 4.7.5 2-pipe fan coil unit with radiator or floor heating Heating or cooling with In 2-pipe applications with radiator, the thermostat controls a valve in radiator or floor heating heating/cooling mode with changeover, heating only, or cooling only plus a radiator valve.
  • Page 82 Functions Control sequences Modulating control: The diagrams below show the control sequence for modulating PI control. 3-position, PWM or DC 0...10 V Heating mode Cooling mode Proportional band "Heating" T[° C] Room temperature (P050) Proportional band "Cooling" Room temperature setpoint (P052) Control command "Valve"...

  • Page 83: 2-Stage On 2-Pipe/4-Pipe Heating And Cooling

    Functions Control sequences 4.7.6 2-stage on 2-pipe/4-pipe heating and cooling 2-stage heating or cooling In 2-stage applications, the thermostat controls 2 valves or 2-stage compressors in series: ● 2-pipe/2-stage: in heating or cooling mode or changeover (automatically or manually). "Cooling only" is factory-set (P001 = 1) ●...
  • Page 84 Functions Control sequences 4.7.6.1 2-pipe/2-stage heating or cooling Heating mode In heating mode, the 1 stage is activated if the acquired temperature is below the setpoint. The 2 stage is activated if the acquired room temperature drops below "setpoint" minus "setpoint differential". Cooling mode In cooling mode, the 1 stage is activated if the acquired temperature is above the...
  • Page 85 Functions Control sequences Modulating control: The diagrams below show the control sequence for modulating PI control. 3-position, PWM or DC 0…10 V Heating mode (P001 = 0) Cooling mode (P001 = 1) Changeover (P001 = 2 or P001 = 3, Changeover (P001 = 2 or P001 = 3, P254 = 0) P254 = 1) (swap function)
  • Page 86 Functions Control sequences 4.7.6.2 4-pipe/2-stage heating and cooling Heating and cooling mode In 4-pipe/2-stage applications, the thermostat controls max. 4 valves in heating and cooling mode or heating/cooling mode by manual selection. Heating and cooling mode (P001 = 4) is factory-set. The 1 stage is activated when the acquired temperature is below (heating) or above (cooling) the setpoint.
  • Page 87 Functions Control sequences Modulating control: The diagrams below show the control sequence for modulating PI control. PWM or DC 0…10 V Heating and cooling mode (P001 = 4) Heating mode with manual selection Cooling mode with manual selection (P001 = 3) or (P001 = 3) or to save energy (P010 = 2 &...

  • Page 88: 4-Pipe Fan Coil Unit

    Functions Control sequences 4.7.7 4-pipe fan coil unit Heating and cooling In 4-pipe applications, the thermostat controls 2 valves in heating and cooling mode, heating/cooling mode by manual selection. Heating and cooling mode (P001 = 4) is factory-set. 4-pipe application with The heating or cooling output can be released via operating mode button if P001 is manual changeover set to Manual (P001 = 3).
  • Page 89 Functions Control sequences Modulating control: The diagrams below show the control sequence of modulating PI control. 3-position, PWM, or DC 0...10 V Heating and cooling mode (P001 = 4) Heating mode with manual selection Cooling mode with manual selection (P001 = 3) or (P001 = 3) or for energy saving (P010 = 2 &...
  • Page 90 Functions Control sequences 4.7.7.1 4-pipe application with PICV and 6-port control ball valve as changeover (RDG26..KN) In a 4-pipe fan coil application with DC 0...10 V fan control, the RDG26..KN controls a combi valve (PICV) in combination with a 6-port ball valve as changeover.

  • Page 91: 4-Pipe Fan Coil Unit With Electric Heater

    Functions Control sequences 4.7.8 4-pipe fan coil unit with electric heater Heating and cooling with In 4-pipe applications with electric heater, the thermostat controls 2 valves in auxiliary heater heating and cooling mode by manual selection, heating only, or cooling only plus an auxiliary electric heater.
  • Page 92 Functions Control sequences Modulating control: The diagrams below show the control sequence for modulating PI control. 3-position or PWM Heating and cooling (P001 = 4) Heating mode with manual selection (P001 Cooling mode with manual selection = 3) (P001 = 3) T[°...

  • Page 93: Chilled/Heated Ceiling And Radiator Applications

    Functions Control sequences 4.7.9 Chilled/heated ceiling and radiator applications For chilled/heated ceiling and radiator applications ● Set the corresponding basic application see Application overview [➙ 42]. ● Disable the fan (P350) The following applications are available: Application for Basic application Section Sequences chilled/heated ceiling,...
  • Page 94 Functions Control sequences Hydraulic and control diagram of the 6-port control ball valve Room temperature setpoint Control command "Valve" (heating) Control command "Valve" (cooling) Vale flow T[℃] Room temperature Default integral action time TN is set to 45 minutes. Control output If the thermostat is set to control sequence "H/C ceiling with 6-port control ball configuration valve", only output Y10 can be used to control the 6-port control ball valve.
  • Page 95 Functions Control sequences 4.7.9.2 Chilled/heated ceiling with pressure independent combi valve (PICV) and 6-port ball valve for changeover (RDG26..KN) The RDG26..KN is able to control a PICV for a chilled and heated ceiling application together with a 6-port ball valve for changeover. This application is only available, if the thermostat is set to a 4-pipe with 6-port ball valve as changeover and PICV application (DIP1 &...

  • Page 96: Compressor Applications

    Functions Control sequences To limit the medium mix (heating and cooling medium), the changeover and the control signal (DC 0…10 V) both work in sequence. When control sequences change, the thermostat closes the combi valve and releases the corresponding relay to operate the ball valve. A delay of 120 seconds is needed before the combi valves can be operated by the thermostat.

  • Page 97: Applications With External Aqr Sensor Or Qmx Room Operator Unit

    Functions Control sequences 4.7.11 Applications with external AQR sensor or QMX room operator unit The equipment combination is intended for commercial buildings, offices, schools, museums, shops, etc. Advantages of equipment combination AQR/QMX sensor LTE- S-Mode Mode Sensor can be installed in the optimal place for ✓...

  • Page 98: Setpoints And Sequences

    Functions Control sequences 4.7.12 Setpoints and sequences 2-pipe applications In changeover applications, the Comfort setpoints for heating and cooling sequence are the same (w). In 2-pipe applications with electric heater, the Comfort setpoint is either at the first heating sequence (in heating mode) or at the cooling sequence (in cooling mode). In 2-pipe applications with radiator, the Comfort setpoint is either at the radiator sequence (in heating mode) or at the cooling sequence (in cooling mode).

  • Page 99: Control Outputs

    Functions Control outputs 4-pipe applications In 4-pipe applications, the Comfort setpoint (w) is in the middle of the dead zone, between the heating and cooling sequences. The dead zone can be adjusted via P055. If manual changeover is selected, either the cooling sequence or the heating sequence is released.
  • Page 100 Functions Control outputs Control DC 2…10 V DC 10…0 V DC 0…10 V DC 10…2 V output Product No. RDG26..KN for 6-port control ball valve application On/Off control signal The valve receives the On command via control output Y1 (Q1 on RDG26..KN) or (2-position) Y3 (Q2 on RDG26..KN), if: 1.
  • Page 101 Functions Control outputs Synchronization 1. When the thermostat is powered up, a close command for the actuator run time by + 150 % is issued to ensure the actuator closes fully and synchronizes to the control algorithm. 2. When the thermostat calculates the positions "fully close" or "fully open", the actuator run time is extended by + 150 % to ensure the correct actuator position is synchronized to the control algorithm.
  • Page 102 DC 2…10 V cooling within one DC 0…10 V or DC 2…10 V signal. for 6-port control ball valve These 2 signals allow for controlling Siemens valves as well as DC 2…10 V valves (RDG26..KN only) by other suppliers. For the same application, RDG26..KN can also provide an inverse signal DC 10…0 V or DC 10…2 V signal for inversed hydraulic connections on the valve.

  • Page 103: Control Output Configuration (Setting Via Dip Switches 7/8 Or Tool, And P201/P203/P204/P205)

    Functions Control outputs 4.8.2 Control output configuration (setting via DIP switches 7/8 or tool, and P201/P203/P204/P205) Overview Application Control outputs Product DC 0...10 V Mod. On/Off On/Off Mod. PWM Mod. RDG…K speed/ DC 0…10 V 3-pos. (3-wire) (2-pos) 1-speed pos) 2-pipe 20..
  • Page 104 Functions Control outputs RDG20..KN The type of the control outputs (2- or 3-position) is set via DIP switches 7 and 8. Patterns of DIP switches 7 and 8: DIP NO.: 7…8 ➨ ON = , OFF = Y1/Y3 = 2-position (PWM) 2-position (PWM) 3-position 3-position...

  • Page 105: Fan Control

    The fan control signal (DC 0…10 V or 3-speed) is selected via DIP switch 6, local HMI (P351) or tool (ACS, ETS or Siemens smartphone application PCT Go). The fan operates in automatic mode or at the speed selected in manual mode.
  • Page 106 Functions Fan control Fan control with For 3-speed fan control: modulating The individual switching points for each fan stage can be adjusted via P353…P355. heating/cooling control The fan speed switch off point is 20% below the switch on point. The diagrams (PWM, 3-pos or below show fan speed control for modulating PI control.
  • Page 107 Functions Fan control Fan control with On/Off In applications with On/Off control: heating/cooling control 1. The switching point for low fan speed is synchronized to the heating/cooling output. P353 (switching point fan speed low) is not relevant. 2. The maximum switching range of the fan (XpH /XpC ) is defined by the switching differential (SDH/SDC) via a reference table.
  • Page 108 Functions Fan control Fan speed I = Min. fan speed selectable via P357 Manual operation DC 0...10 V fan Fan speed II = Medium fan speed selectable via P358 When the DC fan characteristic is not linear, fan speed II can be adapted to an efficient manual speed II.
  • Page 109 Functions Fan control Notes ● The output for the 1 stage (YHC1) in heating mode is also the 1 stage in cooling ● This function is available for DC/3-speed/1-speed fans Example 2 We recommend enabling the swap function on applications with fan coil units and floor heating/cooling.
  • Page 110 Functions Fan control Combination 1 stage Fan behavior stage signal type synchro signal On/off XpH/XpC, sequence P/PI control On/off sequence XpH/XpC, P/PI control On/off /XpC sequence P-control 3-speed 1 sequence XpH/XpC, P/PI control 3-speed 2 XpH/XpC, sequence P/PI control Fan operation as per Fan operation can be limited to be active with cooling only or heating only, or even heating/cooling mode, or disabled via P350.
  • Page 111 Functions Fan control ● Auto fan runs in the dead zone at low speed during cooling only (P029 = 2). During heating, the fan does not run in the dead zone. ● Auto or manual fan does not run in the dead zone (P029 = 3) ●...

  • Page 112: Multifunctional Input, Digital Input

    Functions Multifunctional input, digital input Example Function for On/Off control outputs is listed as per the following figure: Fan operation with combi Fan control is set to enable by default (P350 = 1), if the thermostat is set with valve PICV and a 6-port control sequence "H/C ceiling with PICV and 6-port ball valve as changeover".
  • Page 113 Functions Multifunctional input, digital input Input function Description Type X1/X2/U1 Window contact Digital input to change over the operating mode to Protection. If the window contact is active, user operations Window are ineffective and OFF is displayed. contact Window contact is also possible via bus. In this case, do not assign the function to local inputs X1, X2 or U1.
  • Page 114 Functions Multifunctional input, digital input Input function Description Type X1/X2/U1 11 External temperature The sensor is connected to the pipe and limit measures the temperature of the floor heating water. When the value exceeds the selected limit (P252), heating is stopped. See also Monitoring and limiting functions [➙...

  • Page 115: Handling System Faults

    Functions Handling system faults 4.11 Handling system faults Temperature out of range If the room temperature exceeds or drops below the measuring range, i.e. above 49 ° C or below 0 ° C, the limiting temperatures blink, e.g., 0 ° C or 49 ° C. In addition, the heating output is activated if the current setpoint is not set to Off, the thermostat is in heating mode and the temperature is below 0 °...

  • Page 116: M/S, Manager/Subordinate Configuration In Knx S-Mode

    Functions KNX communications 4.12.2 M/S, Manager/subordinate configuration in KNX S- Mode Manager and subordinate can be bound via parameters or communication objects in S-Mode. Setting manager or subordinate 1 Open the project in ETS and select a device. 2 Click the Parameters tab and set parameter P258 as Manager or Subordinate. 3 If a thermostat is set as subordinate, parameter P259 value needs to be set accordingly.
  • Page 117 Functions KNX communications The following two M/S - manager/subordinate binding options are alternatives. They cannot be used together. M/S - manager/subordinate binding via P901 & P902 Manager and subordinate binding is set using parameters P901 and P902. ● Binding setting on manager ●...
  • Page 118 Functions KNX communications M/S - manager/subordinate binding via communication objects 4 The M/S - manager/subordinate binding is set using communication objects, for object details, see Manager/subordinate communication in KNX S-Mode [➙ 67]. S-Mode objects manager S-Mode objects subordinate Setpoint: Room temp: Current cooling setpoint [93] Room temp: Current cooling setpoint (send)

  • Page 119: Lte-Mode

    Functions KNX communications 4.12.3 LTE-Mode LTE-Mode was specifically designed to simplify engineering. Unlike with S-Mode, individual connections (group addresses) need not be created in the tool. The devices autonomously establish connections. Definitions The following circumstances are predefined: ● Every device or subdevice is located within a zone ●...
  • Page 120 Functions KNX communications Zone where an RDG2..KN KNX room thermostat is physically located. Geographical zone Other room-specific devices may also be located in this zone. (space zone) Information exchanged in this zone is related specifically to the device like (Apartment . Room . Subzone) operating mode, setpoints, room temperature, etc.

  • Page 121: M/S, Manager/Subordinate Configuration In Lte-Mode

    Functions KNX communications 4.12.5 M/S, Manager/subordinate configuration in LTE-Mode In the ACS program, select Plant ➙ Open to open the plant. To open the parameter settings, select Applications ➙ Plant engineering. Select Plant engineering ➙ Device, then set parameter P258 as Manager or Subordinate. A6V11545892_en--_c 121 | 180...
  • Page 122 Functions KNX communications If the device is set as Subordinate, parameter P259 value needs to be set accordingly. Select Applications ➙ Plant operation ➙ Settings ➙ Communication, then set parameters P901 and P902. 122 | 180 A6V11545892_en--_c...

  • Page 123: Example Of Heating And Cooling Demand Zones

    Functions KNX communications 4.12.6 Example of heating and cooling demand zones The building is equipped with Synco controls on the generation side and RDF../RDU../RDG.. room thermostats on the room side. Explanation relating to the In the case of a typical application, the individual RDF../RDG.. room thermostats illustration send their heat demand to the primary controller (in the above example to the RMH760).

  • Page 124: Startup

    Functions KNX communications LTE-Mode/S-Mode Fixed times are specified as follows: ● Receive timeout: 31 minutes ● Send heartbeat: 15 minutes Object [KNX obj. no.] Minutes Default value Room operating mode: Receive Comfort Time switch [13] Application mode [48] Receive Auto Heating/Cooling mode status Receive Heating...

  • Page 125: Fault And Alarms Function On Knx

    Functions KNX communications Example of heating and cooling demand zones [➙ 123]. In S-Mode, the current state signals of the control outputs are available. 4.12.10 Fault and alarms function on KNX A fault is sent on the bus in the event of a fault occur (for example, digital fault input, Dewpoint, communication configuration, etc.).

  • Page 126: Communication Objects

    Functions Communication objects Priority of alarms ● Priority order is #1…7 ● External faults #4…6: If faults are active, the display shows AL1, AL2, AL3, alternating. Only the fault with the highest priority is sent over the bus. A supervisor alarm system may command the thermostat to stop sending faults to the bus via the communication object "Fault transmission"...
  • Page 127 Functions Communication objects Object No. and name Thermostat Object No. and name 1 System time 4 Fault information 2 Date 5 Fault status (0 = No alarm / 1 = Alarm) 3 Time of day 8 Room operating mode: Preselection 6 Fault transmission (0 = Disable / 1 = Enable) 94 Room operating mode: Status (receive) 17 Room operating mode: Status...

  • Page 128: Description Of Communication Objects

    Functions Communication objects 4.13.2 Description of communication objects Type/ Type/ Object name Function Flags Object name Function Flags length length System time Time and date 19.001 Room operating Trigger 1.017 8 bytes mode: 1 bit Preselection System time for display on the room thermostat. See P009 (3 or 4) - Auto - Comfort Date...
  • Page 129 Functions Communication objects Object name Function Type/ Flags Object name Function Type/ Flags length length Room temp: [P19] Temperature 9.001 Room temp: Temperature 9.001 Economy heating 2 bytes Comfort setpoint 2 bytes setpoint abs (receive) Communication object adjusts the Economy heating setpoint used Communication object shifts the setpoint (absolute) used by the by the thermostat (Manager) (see Setting and adjusting setpoints thermostat (Manager) received via bus (see Setting and adjusting...
  • Page 130 Functions Communication objects Object name Function Type/ Flags Object name Function Type/ Flags length length Extended comfort 1.011 Application mode HVAC control 20.105 mode status 1 bit mode 1 byte Indicates the status of Comfort mode extension of manager. Auto (default) Heating and/or cooling External room Temperature...
  • Page 131 Functions Communication objects Object name Function Type/ Flags Object name Function Type/ Flags length length Fan output 0…100 % 5.001 Heating, control Inactive 1.011 1 byte value status Active 1 bit Indicates the current fan speed as a value 0...100 %. DC fan output (physical 3-speed Speed...
  • Page 132 Functions Communication objects Object name Function Type/ Flags Object name Function Type/ Flags length length Hum. Control Inactive 20.115 Enable or disable Disable 1.003 mode Humidification 1 byte Leaf indication Enable 1 bit Dehumidification Indicates the mode of the humidity control function: Enables or disables the leaf (green or red) indication.
  • Page 133 Functions Communication objects Object name Function Type/ Flags Object name Function Type/ Flags length length Room temp: 9.001 DC fan speed: 5.001 Temperature 0...100 % Current cooling 2 bytes Maximum speed 1 byte setpoint (receive) cooling Communication object adjusts the current cooling setpoint DC fan speed for maximum cooling output received via bus.

  • Page 134: Communication Objects (Lte-Mode)

    Functions Communication objects (LTE-Mode) 4.14 Communication objects (LTE-Mode) Geographical zone A.R.S (Time switch zone) Room operating mode: Time switch X.1.1/X.Y.1 Application mode Geographical zone Room operating mode: Preselection A.R.S X.Y.1 Room temperature Comfort setpoint Room humidity [% r.h.] Setpoint heating Setpoint cooling Fan speed Setpoint shift heating...

  • Page 135: Control Parameters

    4.15 Control parameters To optimize control performance, a number of control parameters can be readjusted on the thermostat via HMI, commissioning/operating tool, or Siemens smartphone application PCT Go. These parameters can also be set during operation without opening the unit.

  • Page 136: Setting/Downloading Parameter Via Tool

    Connecting a KNX tool Connecting a KNX commissioning/operating tool to the RDG2..KN is described in Commissioning. 4.15.3 Commissioning parameter via Smartphone app PCT The Siemens smartphone application Product Commissioning Tool (PCT Go) is a commissioning tool to: ● Read and write thermostat parameters ●...
  • Page 137 Functions Control parameters Unpowered thermostat from Antenna area individual package DIP switche settings take priority: ● If all DIP switches are set to Off (default), PCT Go can be used to change the application (e.g. 2-pipe) ● If an application is set via DIP switches, PCT Go cannot change it. Change settings while the device is powered and running: ●...

  • Page 138: Service Level Parameters

    Functions Control parameters 4.15.4 Service level parameters Parameter display depends on selected application and function. Appl means application. Parameter values are only visible when the device is set as Manager (M), Subordinate (S) or both identification (✓). Name Service level P001 Control sequence 2-pipe: 0 = Heating only...
  • Page 139 Functions Control parameters Name Service level P024 Humidity setpoint high --- (0), P026 or 20…90 % P450, P258 P026 Humidity setpoint low --- (0), 20…90 % or P024 P450, P258 P027 Electric heater when cooling ON: Enabled ✓ ✓ Appl OFF: Disabled P028 Keypad...

  • Page 140: Expert Level Parameters With Diagnostics And Test

    Functions Control parameters 4.15.5 Expert level parameters with diagnostics and test Parameter display depends on selected application and function. Parameter values are only visible when the device is set as Manager (M), Subordinate (S) or both identification (✓). Name Expert level Control settings P050 Heat P-band Xp...
  • Page 141 Functions Control parameters Name Expert level Inputs P150 Input X1 P150:1 0 = --- (no function) ✓ ✓ P153: P150, P153: 0 1 = Room temp ext. sensor / return (AI) P155 P153 Input X2 ✓ ✓ P155: 2 = H/C changeover (AI/DI) P155: P150, P155 Input U1 (RDG200KN&RDG260KN)
  • Page 142 Functions Control parameters Name Expert level P217 RDG26xKN: Power of electric 0 kW 0.0…1.2 kW P203, P204 ✓ ✓ heater on Q2 Features P250 Valve kick ON = Enabled ‒ ✓ ✓ OFF = Disabled P251 Purge time (every 2 hours) --- (0, Not active), 1…5 min P258 P252...
  • Page 143 Functions Control parameters Name Expert level Controller P450 Control strategy RDG200KN & 0 = Temperature (T) ✓ ✓ P258 RDG260KN: 0 1 = Temperature (T) + Relative humidity (r.h.) RDG204KN & 2 = Temperature (T) + Air quality (IAQ) ✓ ✓...
  • Page 144 Functions Control parameters Diagnostics and test Parameter Name Range Dependencies Diagnostics and test Application number 0 = (No application) ‒ 1 = 2-pipe 2 = 2-pipe with electric heater 3 = 2-pipe with radiator 4 = 4-pipe 5 = 2-pipe / 2-stage 6 = 4-pipe with electric heater 7 = 4-pipe / 2-stage 8 = 4-pipe:6-port H/C (no fan)

  • Page 145: Supported Knx Tools

    Supported KNX tools 5 Supported KNX tools 5.1 ETS ETS is an engineering tool to fully commission RDG2..KN room thermostats. ETS can implement the following functions: ● Define and download the physical address ● Define and download the application (plant type, control sequence) −...

  • Page 146: Setting Parameters In Ets

    Supported KNX tools 5.1.1 Setting parameters in ETS 1 Open the project in ETS and select a device. 2 Click the Parameter tab, and adjust the control parameters as follows: 146 | 180 A6V11545892_en--_c...
  • Page 147 Supported KNX tools 3 Plant type (application), Control Sequence and other control parameters ([Pxx] description) can be downloaded. For more details on control parameters, see Control parameters [➙ 135]. ● Notes ETS version 4 or higher is used to assign communication objects to group addresses (S-Mode) ●...

  • Page 148: Acs Tool

    Supported KNX tools ACS tool 5.2 ACS tool The ACS tool is used to commission the RDG2..KN KNX room thermostats (physical address, application, parameters). They can be operated or monitored by bus during normal operation. This section does not describe how to define the physical address and only provides a brief overview of ACS main function.
  • Page 149 Supported KNX tools ACS tool Some parameters in ACS have a range different from that on the room thermostats. The thermostat does not accept changes outside its range. This can be seen online in that a changed value returns to the original value. Use the ranges described in the parameter tables in Control parameters [➙...

  • Page 150: Operation And Monitoring With Acs

    Supported KNX tools ACS tool 5.2.2 Operation and monitoring with ACS In the ACS program, select Plant ➙ Open to open the plant. To open monitoring and operation, select Applications ➙ Plant operation. Parameter settings in ACS The ACS tool supports parameter settings even during normal operation. To change a control parameter, double-click the parameter in Standard popcard for the settings.
  • Page 151 Supported KNX tools ACS tool Plant diagram in ACS The ACS tool offers plant diagrams for easy monitoring and operation of the thermostat. To start the application, select Applications ➙ Plant operation ➙ Standard diagram. A6V11545892_en--_c 151 | 180...
  • Page 152 Supported KNX tools ACS tool The ACS tool provides standard plant diagrams for RDG2..KN room thermostats, depending on the following configuration: Plant type Application Application configuration configuration 2-pipe 2-pipe fan coil unit Radiator – Control sequence: No impact – Control sequence: Heating only (P001 = 0) (P001 = any) –...
  • Page 153 Supported KNX tools ACS tool Plant type Application Application configuration configuration 4-pipe fan coil unit with PICV and 6-port H/C ceiling with PICV and 6-port control control ball valve as changeover ball valve as changeover – Fan operation: Must be enabled –...

  • Page 154: Operation And Monitoring With Ozw772

    Supported KNX tools ACS tool 5.2.3 Operation and monitoring with OZW772 HomeControl app for plant control The OZW772 web server allows users to operate a Synco HVAC system from a remote location – via a PC or from a smart phone using the HomeControl app. The start page displays the most important data points.

  • Page 155: Connection

    Connection Connection terminals 6 Connection 6.1 Connection terminals RDG20..KN L, N Operating voltage AC 230 V / AC 24 V X1, X2 Multifunctional input for temperature sensor (NTC 3k or LG-Ni1000) or potential-free switch (function can be selected via parameter) Same as multifunctional inputs X1, X2 Measuring neutral for sensors and switches CE+, CE-...

  • Page 156: Connection Diagrams

    Connection Connection diagrams 6.2 Connection diagrams Connection workflow: Select fan control type: DC, 1-speed or 3-speed fan ● ● Select application type, e.g. 4-pipe ● Columns V1, V2, V3, V4 show the output types (e.g. for 4-pipe: YH for heating and YC for cooling) as well the available control signals ●...
  • Page 157 Connection Connection diagrams RDG20..KN DC 0…10 V fan 1-speed/3-speed fan Application Equipment Terminals Terminals Q1, Q2, Q3 2-pipe 3-speed Control outputs: 2-pos ✓ ✓ 3-pos Application Equipment Terminals Terminals Q1, Q2, Q3 2-pipe + RAD 4-pipe 3-speed 2-pipe/2-stage YHC1 YHC2 Control outputs: 2-pos 2-pos...
  • Page 158 Connection Connection diagrams RDG26..KN DC 0…10 V fan 1-speed/3-speed fan Application Equipment Terminals Terminals Q1, Q2, Q3 2-pipe 3-speed Control outputs: ✓ ✓ On/Off Application Equipment Terminals Terminals Q1, Q2, Q3 2-pipe + RAD 4-pipe 2-pipe/2-stage 3-speed YHC1 YHC2 Control outputs: On/Off ✓...

  • Page 159: Iaq - Co Connection Diagrams

    Connection IAQ - CO2 connection diagrams RDG26..KN Chilled/heated ceiling with 6-port control ball 4-pipe with 6-port ball valve as changeover and valve PICV Application Room thermostat RDG26..KN 6-port modulating control actuator S1, S2, S3 Switch (keycard, window contact, presence PICV control valve detector etc.) B1, B2, B3 Temperature sensor (return air temperature, external room temperature, changeover sensor, etc.)

  • Page 160: Application Examples

    Connection Application examples 6.4 Application examples The examples are described for RDG26..KN, but they also apply to RDG20..KN. Control output (P201, P204) and terminals for the valves (Y1, Y2) need to be adapted accordingly. 6.4.1 Humidity control Note: In the following examples, P461 is configured based on the connected type of equipment.
  • Page 161 Connection Application examples Example 2: 2-pipe fan coil application for dehumidification, with DC 0...10 V fan and DC valve Dehumidifier, (without temperature setpoint shifting): DC 0...10 V fan + valve, No shifting setpoint Commissioning Outputs used ● ● P351 = 3 DC 0...10 V fan (or DIP6 = OFF) ●...
  • Page 162 Connection Application examples Example 4: 2-pipe fan coil application for dehumidification, with temperature setpoint shifting, Dehumidifier + dehumidifier contact, DC 0...10 V fan and DC valve, humidification is controlled by humidifier/DC 0...10 V fan release contact: Commissioning Outputs used ● ●...

  • Page 163: Relay Functions

    Connection Application examples 6.4.2 Relay functions Example 1: 2-pipe fan coil application, fan coil unit off during Protection mode. Switching off the fan coil unit Commissioning Outputs used ● ● P351 = 3 DC 0...10 V fan (or DIP6 = OFF) ●...
  • Page 164 Connection Application examples Example 3: Compressor application, with reversing valve (heating/cooling) and DC 0...10 V fan: Compressor and reversing valve Commissioning Outputs used ● ● Application 4-pipe DC 0...10 V ● Control output P201 = 4 (On/Off) ● Reversing ● P351 = 3 valve (or DIP6 = OFF)

  • Page 165: Swap Function And/Or Fan In The 2Nd Stage

    Connection Application examples 6.4.3 Swap function and/or fan in the 2nd stage Example 1: 2-pipe fan coil application for floor heating/cooling (2-stage heating/cooling), fan Fan in the 2 stage runs only in the 2 stage: Commissioning Outputs used ● ● P350 = 4 (2 stage) DC 0...10 V fan...
  • Page 166 Connection Application examples Example 2: 2-pipe and 2-stage application with radiant heating/cooling panels, the fan only Swap and fan in the 2 operates with the fan coil unit: stage ● Heating sequence: 1 panel and 2 fan coil unit ● Cooling sequence: 1 fan coil unit and 2 panel...
  • Page 167 Connection Application examples Example 3: 2-pipe fan coil and 2-stage application with different types of equipment (On/Off Swap and fan in the 2 control outputs), the fan only operates if output V1 is energized. stage Commissioning Outputs used ● ● P350 = 5 (Heating DC 0...10 V fan (2 and 2...

  • Page 168: Iaq - Co 2 Control

    Connection Application examples 6.4.4 IAQ - CO control Example 1: 4-pipe heating and cooling fan coil system, for DC valves and fan, with IAQ IAQ monitoring indication (text) on the display: Commissioning Outputs used ● ● Application 4-pipe DC 0...10 V fan ●...
  • Page 169 Connection Application examples Example 3: 4-pipe heating and cooling fan coil system, power supply 230 V, for PWM valves IAQ control with On/Off and DC fan, CO indication (ppm) on the display, IAQ control via On/Off damper: damper Commissioning Outputs used ●...

  • Page 170: Technical Data

    Technical data 7 Technical data Power supply (RDG20..KN) AC 24 V ± 20 % or Operating voltage (L-N) AC 230 V +10/-15 % (selectable via slider) Frequency 50/60 Hz Power consumption 4 VA @ AC 24 V 7 VA @ AC 230 V ●...
  • Page 171 Technical data Outputs (RDG20..KN) Control outputs Solid state (triacs) Y1, Y2, Y3, Y4-N AC 24 V or AC 230 V (linked to power supply) 8 mA...1 A Yx power limitation 3 A fast microfuse, cannot be exchanged Power supply (RDG26..KN) Operating voltage (G-G0) AC 24 V ±...
  • Page 172 Technical data Outputs (RDG26..KN) Use for external equipment (Q1, Q2, ● Rating min., max. resistive/inductive 5 mA…1 A ● Max total load current Q1+Q2+Q3 No internal fuse! External preliminary protection with max. C 10 A circuit breaker required for all cases.
  • Page 173 Technical data Operational data Comfort mode (P011) 21 °C (5…40 ° C) Economy mode (P019-P020) 15 ° C/30 °C (OFF, 5…40 ° C) Protection mode (P100-P101) 8 °C/OFF (OFF, 5…40 ° C) Multifunctional inputs X1/X2/U1 Selectable (0…25) (P150) 1 (external temperature sensor, room or Input X1 default value return air) Input X2 default value...
  • Page 174 Technical data Environmental conditions Mechanical conditions Class 2M2 Operation IEC 60721-3-3 Climatic conditions Class 3K5 Temperature 0…50 ° C Humidity < 95 % r.h. Standards and directives EU conformity (CE) A5W00120120A Electronic control type 2.B (micro-disconnection on operation) RCM conformity A5W00120121A Safety class II as per EN 60730...
  • Page 175 Synco 700, 900 and RXB/RXL Basic documentation Desigo CM1Y9775 Desigo RXB integration – S- Mode CM1Y9776 Desigo RXB/RXL integration – individual addressing CM1Y9777 Third-party integration CM1Y9778 Synco integration CM1Y9779 Working with ETS *) The documents can be downloaded from https://hit.sbt.siemens.com. A6V11545892_en--_c 175 | 180...

  • Page 176: Dimensions

    Dimensions 8 Dimensions Dimensions in mm RDG2..KN ARG200 176 | 180 A6V11545892_en--_c...

  • Page 177: Index

    Index Index Economy cooling setpoint .........39 1-speed ............107 Economy heating setpoint.........39 Electric heater enable/disable ....... 113 3-position control signal ........99 Enable/disable electric heater....79, 91, 113 3-speed ............107 Expert level parameters ......... 135 External/return air temperature ..... 112 External/return air temperature sensor ....49 6-port ball valve ..........96 Fan in Auto mode ..........
  • Page 178 Index KNX LTE-Mode ..........119 Setpoint high ..........59 KNX overview ..........115 Setpoint low ........... 59 KNX parameters ..........146 Setpoint priority ..........41 KNX S-Mode ..........115 Setpoint Protection mode ......98 KNX tools ............145 Setpoints - setting via bus ......38 Setpoints and sequences ......
  • Page 179 A6V11545892_en--_c 179 | 180...
  • Page 180 Issued by Siemens Switzerland Ltd Smart Infrastructure Global Headquarters Theilerstrasse 1a CH-6300 Zug +41 58 724 2424 www.siemens.com/buildingtechnologies © Siemens Switzerland Ltd, 2021 Technical specifications and availability subject to change without notice. A6V11545892_en--_c...

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